Gooloo via Amazon offers the Gooloo Portable 600-amp Peak 15,000mAh Car Jump Starter/Battery Charger for $69.99. Coupon code "85UQJRD5" cuts that to $45.49. With free shipping, that's $13 under our February mention and the lowest price we've seen. (It's also $24 below the best price we could find for a similar charger today.) It features dual USB ports and safety protection.